OpenDMARC Library (libopendmarc)

Introduction

DMARC stands for "Domain-based Message Authentication, Reporting & Conformance".
It is a technical specification created by a group of organizations to help reduce the potential for
email-based abuse by solving long-standing operational, deployment, and reporting
issues related to the existing email authentication protocols of DKIM and SPF. More information
about DMARC can be found at the dmarc.org website.

This API (libopendmarc) at its current release, allows an application
to look up DMARC records and to apply policy to application supplied DKIM and SPF results.
An implementation of a filter, using Sendmail's milter
package, uses this libopendmarc library.